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A high dose ensures the body gets what it needs, even in severe cases
Young adults may also experience absorption challenges due to MTHFR genetic mutations, food intolerances, digestive disorders, antacid use, excessive alcohol consumption, and smoking
This autoimmune condition destroys gastric parietal cells, eliminating intrinsic factor production essential for B12 absorption
Timing Optional Marker Homocysteine Why it matters Adds methylation and cardiovascular context when B-vitamin status is being reviewed
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